<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>拉伸</title>
		<style>
			.transitionbox{
				width:100px;
				height: 100px;
				border: 2px solid;
				
				/*横向拉伸效果，执行时间2s*/
				transition:  2s;
			}
			/*鼠标移入div触发动画执行*/
			.transitionbox:hover{
				width: 500px;
				height:500px;/*拉伸到宽度从100到300*/
			}
		</style>
	</head>
	<body>
		<h3>拉伸盒子动画效果</h3>
		<h4>transition它有两个参数：拉伸方向width,2s动画执行时间</h4>
		
		<div class="transitionbox"></div>
	</body>
</html>
